Stable and Efficient Coherent Pulse Stacking Amplification of 81 Pulses with Four Channel Coherent Spatial Combining at 7mJ/Fiber

An integrated CPSA and CBC femtosecond fiber laser system temporally combines 81 pulses and spatially combines 4 amplifiers, achieving efficient amplifier energy extraction at 7mJ/fiber and 25mJ total, a record high energy per fiber.